Finding the Fourth Proportional to 1,555.06, 2,146.03 and 891.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,555.06 : 2,146.03 = 891.78 : x
2. Step 2: Convert to fraction form
   1,555.06/2,146.03 = 891.78/x
3. Step 3: Cross multiply
   1,555.06x = 2,146.03 × 891.78
4. Step 4: Simplify right side
   1,555.06x = 1,913,798.23
5. Step 5: Solve for x
   x = 1,913,798.23/1,555.06
6. Step 6: Final answer
   x = 1,230.69